Simplify: x2−y2x2+2xy+y2⋅x+yx−y\frac{x^2 - y^2}{x^2 + 2xy + y^2} \cdot \frac{x+y}{x-y}x2+2xy+y2x2−y2⋅x−yx+y.
111
x−yx+y\frac{x-y}{x+y}x+yx−y
x+yx−y\frac{x+y}{x-y}x−yx+y
−1-1−1